| Baihe area of ordos basin is a new exploration blocks, to study its reservoir characteristicsand control factors that can provide a scientific basis for the subsequent geological explorationand development of oil and gas prediction of favorable areas. The sedimentary facies of Chang8oil group in study area is delta front subfacies, the reservoir is mainly distributed in theunderwater distributary channel sand body, belong to low to ultra-low permeability reservoir,rock types mainly feldspathic lithic sandstone and lithic feldspathic sandstone, pore typesmainly dissolution pore, with a strong heterogeneity of reservoirs. Diagenesis types are mainlycompaction, cementation and dissolution. Diagenetic evolution stages is A period of main rockup stage. In reservoir comprehensive evaluation, this paper will be of the high quality reservoirstandard as permeability≥0.15x10-3um2, porosity≥7.5%, and thickness≥10m. Combinedwith the research of diagenetic facies, chlorite film diagenetic facies and relatively goodphysical feldspar dissolution diagenetic phase are an area of high quality reservoirdevelopment.Study area is the lithologic reservoir, the high quality reservoir is mainly controlled bysedimentation and diagenesis. Sedimentation is the foundation, the impact of the developmentof high quality reservoir by controlling the types of sedimentary facies and reservoir rocktypes, composition and structure, etc. The influence of diagenesis on reservoir physicalproperties are divided into constructive and destructive. Strong compaction and cementation ofcarbonate in the late of reservoir porosity, permeability variation, is the destructive effect, andthe cementation of clay minerals on reservoir physical property is both destructive effects andconstructive effects. Secondary porosity by dissolution improved the reservoir properties ofreservoir, has played a constructive role, and become one of the important factors that controlthe high quality reservoirs formation. |
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